package com.atguigu.springcloud.lb;

import org.springframework.cloud.client.ServiceInstance;
import org.springframework.stereotype.Component;

import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;

@Component
public class MyLB implements LoadBalancer {
    private AtomicInteger atomicInteger= new AtomicInteger(0);
    public final  int getAndIncrement(){
        int current;
        int next;
        do{
            current= this.atomicInteger.get();
            next = current>2147483624?0:current+1;

        }while (!this.atomicInteger.compareAndSet(current,next));

        System.out.println("第几次访问 次数next:"+next);
        return  next;

    }
    @Override
    public ServiceInstance instance(List<ServiceInstance> serviceInstances) {
        int index = getAndIncrement() % serviceInstances.size();

        return serviceInstances.get(index);
    }
}
